User Interface Process Application Block for .NET

http://msdn.microsoft.com/library/en-us/dnbda/html/uip.asp
also:
http://msdn2.microsoft.com/en-us/library/ms998252.aspx

Update
User Interface Process (UIP) Application Block - Version 2.0
http://msdn2.microsoft.com/en-us/library/ms979217.aspx